Display panel having cathode layer electrically connected to auxiliary cathode layer and manufacturing method thereof

A display panel, comprising:

• a substrate;
• an array layer disposed on the substrate;
• a patterned first auxiliary cathode layer disposed on the array layer;
• a planarization layer disposed on the first auxiliary cathode layer;
• a patterned second auxiliary cathode layer and an anode layer both disposed on the planarization layer, wherein the second auxiliary cathode layer is electrically connected to the first auxiliary cathode layer through a via hole;
• a pixel definition layer disposed on the second auxiliary cathode layer and provided with a pixel opening and a connecting hole corresponding to the second auxiliary cathode layer, wherein the pixel definition layer is a hydrophilic material, and the connecting hole is disposed between adjacent two of the pixel openings;
• an organic light-emitting layer disposed on the pixel definition layer, wherein the second auxiliary cathode layer is exposed to the connecting hole through the organic light-emitting layer;
• and
• a cathode layer disposed on the organic light-emitting layer and electrically connected to the second auxiliary cathode layer through the connecting hole, wherein an entire inner surface of the connecting hole is covered by and completely directly contacts the cathode layer, and each of the second auxiliary cathode layer and the first auxiliary cathode layer has a sheet resistance lower than a sheet resistance of the cathode layer,
• wherein the pixel definition layer comprises an organic light-emitting material infiltration portion in a peripheral area of the connecting hole, and the organic light-emitting material infiltration portion contains a material for formation of the organic light-emitting layer.

A method of manufacturing a display panel, the method comprising following steps:

• S1:
• providing a substrate, and forming an array layer on the substrate, and a patterned first auxiliary cathode layer on the array layer;
• S2:
• fabricating a planarization layer on the substrate, and forming a patterned auxiliary second cathode layer and an anode layer both disposed on the planarization layer, wherein the second auxiliary cathode layer is electrically connected to the first auxiliary cathode layer through a via hole;
• S3:
• fabricating a pixel definition layer on the second auxiliary cathode layer, and patterning the pixel definition layer to form a pixel opening corresponding to the anode layer and a connecting hole corresponding to the second auxiliary cathode layer, wherein the pixel definition layer is a hydrophilic material;
• S4:
• fabricating an organic light-emitting layer on the pixel definition layer, and preparing a solvent for dissolving the organic light-emitting layer on a surface of the organic light-emitting layer corresponding to the connecting hole, dissolving the organic light-emitting layer corresponding to a location of the connecting hole by reaction of the solvent so that the organic light-emitting layer infiltrates into the pixel definition layer around the connecting hole, and exposing the second auxiliary cathode layer corresponding to the connecting hole;
• and
• S5:
• fabricating a cathode layer on the organic light-emitting layer, wherein the cathode layer is electrically connected to the second auxiliary cathode layer through the connecting hole, an entire inner surface of the connecting hole is covered by and completely directly contacts the cathode layer, and each of the second auxiliary cathode layer and the first auxiliary cathode layer has a sheet resistance lower than a sheet resistance of the cathode layer,
• wherein step S4 further comprises:
• S41:
• fabricating the organic light-emitting layer on a complete surface of the pixel definition layer;
• S42:
• printing the solvent in the connecting hole using a printing method, dissolving the organic light-emitting layer in the connecting hole by the solvent, and forming an organic light-emitting material, wherein the organic light-emitting material infiltrates into the pixel definition layer around the connecting hole to configure the pixel definition layer with an organic light-emitting material infiltration portion formed in a peripheral area of the connecting hole.